<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>

        * {
            margin: 0;
            padding: 0;
        }

        .container {
            display: flex;
            flex-direction: row;
            align-items: center;
        }

        .my0 {
            width: 300px;
            height: 70px;
            border: 1px solid blue;
            background-color: royalblue;
        }

        .my {
            width: 300px;
            height: 100px;
            border: 1px solid blue;
            background-color: #bcbcbc;
        }

        .my:last-child{
            margin-right:100px;

        }

    </style>
</head>
<body>
<div class="container">
    <div class="my0">1</div>
    <div class="my">2</div>
    <div class="my">3</div>
</div>
</body>
</html>